Abstract
The proper hydrogenation of Hyper-coal (HPC) using 1,2,3,4-tetrahydroquinoline (THQ) was able to decrease the oxygen content and adjust the molecular structure of HPC for preparing the spinnable pitch with high softening point (SP). The spinnable pitch prepared from the THQ-soluble (QS) fraction of HPC as a precursor consisted of more naphthenic carbon groups than that prepared from the 1-methylnaphthalene (1-MN) soluble (MNS) fraction of HPC. The HPC-QS derived spinnable pitch showed excellent spinning performance even though the SP of 260 °C, and the tensile strength of the resultant carbon fiber was increased to 1350 MPa with a diameter around 8 µm under the only carbonization temperature of at 800 °C for 5 min.
Highlights
A steady and sharp increase in the application market and prospect of carbon fibers (CFs) in the future can be predicted because of their low density and excellent mechanical properties, good electrical and thermal properties
The mixtures were filtered with 1 μm polytetrafluoroethylene filter paper at room temperature and the soluble fraction was evaporated at 200 ◦ C with a vacuum degree of 133 Pa for recycling the THQ solvent
The oxygen content of HPC-MNS of 3.46 wt % was marginally higher than that of pristine HPC of 2.95 wt %, while the oxygen content of HPC-QS decreased to 2.27 wt %
Summary
A steady and sharp increase in the application market and prospect of carbon fibers (CFs) in the future can be predicted because of their low density and excellent mechanical properties, good electrical and thermal properties. The prospects and large-scale consumption of CFs are still limited by their high cost and insufficient properties, which come from the expensive raw material, low precursor yield and complex production processes of CFs. there is much room to reduce the production cost and improve the property of CFs, and it is great challenge to expand a huge market for CFs as a low-carbon green material in environmental and low-energy applications. The feasible route for achieving the target of low-cost CFs production is to prepare the fiber precursors using cheap raw materials
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